City pulse in stealth mode

Overview

Aquajet’s new Ecosilence Power Pack is being tested on extensive city centre bridge and tunnel hydrodemolition projects in Stockholm, beating all expectations.

Project Details

• Renovation work underway at the heart of Stockholm’s historic Old Town
• Two adjacent city centre projects: 'Three Bridges' and the second phase of the Söderleds tunnel
• Central Bridge restoration, including two viaducts over the Söderström and Norrström
• Total area of almost 9,000 m² for the Three Bridges project
• Concrete bridge deck surface in the center of the 1.2 km long bridge is badly deteriorated
• Hydrodemolition techniques and the new Aquajet Systems Power Pack used for the center 500 m and water jetting the remainder
• Work on the southbound tunnel in the 1.85 km northbound Söderleds tunnel, resurfacing both the wall impact protection concrete slabs and the roof

Noise Control

The Ecosilence Power Pack’s performance is very much appreciated on the bridge, with its noise level being less than half that of conventional power packs and similar to that of a normal conversation. The use of conventional power packs in open areas often requires special 'shells' to be fitted over them at an additional cost of up to €10,000. Its development will help contractors meet the increasingly stringent operational noise requirements that are imposed when working close to sensitive locations such as residential and office complexes.

Operational Benefits

• Significant fuel savings, estimated at €35,000 a year in a typical operation
• Ecosilence’s efficient design means a saving of up to 30 l/h when producing a water output of 200 l/min at 1,000 bar and 1500 rpm at just 70% of its full power capacity
• Traditional power packs use between 105 l/hr and 120 l/hr

Technical Advantages

• Does not damage the concrete and provides a better surface to work with
• No possibility of causing any cracks, whether micro-cracks or bigger ones
• Water jets can get right under and behind the rebar